Y+3x=21

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Solution for Y+3x=21 equation: 


Simplifying
Y + 3x = 21

Solving
Y + 3x = 21

Solving for variable 'Y'.

Move all terms containing Y to the left, all other terms to the right.

Add '-3x' to each side of the equation.
Y + 3x + -3x = 21 + -3x

Combine like terms: 3x + -3x = 0
Y + 0 = 21 + -3x
Y = 21 + -3x

Simplifying
Y = 21 + -3x

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